CN105348797B - A kind of graphene-based heat conductive silica gel phase change composite material and preparation method thereof - Google Patents
A kind of graphene-based heat conductive silica gel phase change composite material and preparation method thereof Download PDFInfo
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Abstract
The present invention provides a kind of graphene-based heat conductive silica gel phase change composite material, including：Silica gel matrix and it is scattered in the silica gel intrinsic silicon heat conduction phase-change material；The heat conduction phase-change material includes heat filling and microencapsulated phase change material；One or more of the heat filling in graphene, alumina powder, aluminium nitride powder and carbon nanotubes.The present invention can form complete thermal conducting path in silica gel, improve the thermal conductivity of composite material by adding heat filling into silica gel.Also, microencapsulated phase change material is added inside silica gel, improves the latent heat of compound silica gel material, a part of heat can be stored while heat conduction.The synergistic effect of heat conductive silica gel and phase-change material at the same time, makes the conduction of heat more effective.
Description
Technical field
The invention belongs to heat conductive silica gel technical field, and in particular to a kind of graphene-based heat conductive silica gel phase change composite material and
Its preparation method.
Background technology
Heat conductive silica gel is a kind of high-end heat conduction compound, with its will not solidification, will not be conductive characteristic can be to avoid
Such as short circuit equivalent risk.Also, the high-adhesion of heat conductive silica gel can be current CPU, GPU with superpower heat-conducting effect and dissipate
Optimal heat conduction solution during hot device contact.
Heat conductive silica gel is uniformly filled in macromolecule matrix material using heat filling, to improve its heat conductivility.Often
High heat conduction filler is mainly ceramics, metal etc..And these traditional heat fillings are filled with many shortcomings, than if desired for
High loading can be only achieved the high thermal conductivity of comparison, so that the mechanical performance of silica gel has been seriously affected, furthermore high loading
Also increase cost.
Graphene (Graphene) is a kind of new material for the individual layer laminated structure being made of carbon atom.It is one kind by carbon
Atom is with sp2Hybridized orbit composition hexangle type is in the flat film of honeycomb lattice, the two-dimensional material of only one carbon atom thickness.
The grapheme material of a this only carbon atom thickness, is nano material most thin and most hard in the world, only absorbs
2.3% light, thermal conductivity factor are up to 5300W/mK, higher than carbon nanotubes (3000W/mK) and diamond (2300W/m
K), and such two-dimensional structure has the specific surface area of super large and good chemical stability.These good properties make
Obtaining the material based on graphene becomes a kind of preferable Heat Conduction Material, is widely used in electronics, communication, illumination, aviation and national defence
Many fields such as military project.But graphene is easy to reunite, thermal conducting path can be influenced because of reuniting in filling intrinsic silicon
Formed.
In addition, with the development of the social economy, the mankind increasingly increase the demand of the energy.For this reason, people begin look for it is green
Color regenerative resource goes resource increasingly deficient on the substitution earth, such as solar energy, wind energy, geothermal energy etc..However, these energy
The intermittent utilization to the mankind bring very big inconvenience, how the energy is subjected to storage well and is just particularly important.
But existing heat conductive silica gel thermal conductivity is generally relatively low, while latent heat is very low, and energy cannot be stored while heat conduction
Amount.
The content of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of graphene-based heat conductive silica gel phase transformation composite wood
Material and preparation method thereof, the thermal conductivity of graphene-based heat conductive silica gel phase change composite material provided by the invention is higher, and is leading
Energy can also be stored while hot.
The present invention provides a kind of graphene-based heat conductive silica gel phase change composite material, including：
Silica gel matrix and it is scattered in the silica gel intrinsic silicon heat conduction phase-change material；
The heat conduction phase-change material includes heat filling and microencapsulated phase change material；The heat filling be selected from graphene,
One or more in alumina powder, aluminium nitride powder and carbon nanotubes.
Preferably, the heat conduction phase-change material and the mass ratio of silica gel matrix are (50~70)：(30~50).
Preferably, the mass ratio of the heat filling and microencapsulated phase change material is (15~50)：(20~32).
Preferably, the core shell structure that the microencapsulated phase change material is made of core and wall material, the wall material are high score
Sub- polymer, the core are phase-change material and the mixture of graphene.
Preferably, the alumina powder is the alumina powder being modified by surface, and the aluminium nitride powder is process
The aluminium nitride powder that surface is modified.
Preferably, the alumina powder is selected from the alumina mixed powder that particle diameter is 1~70 μm.
Preferably, the silica gel is A/B two-component silica gel, and the A/B two-components silica gel is selected from SEMICOSIL 9212A/B
Type A/B two-components silica gel, SilGel 612A/B type A/B two-components silica gel, SEMICOSIL 905A/B type A/B two-component silica gel
Or SilGel 614A/B type A/B two-component silica gel.
Preferably, the preparation method of the microencapsulated phase change material is interfacial polymerization or situ aggregation method.
Present invention also offers a kind of preparation method of graphene-based heat conductive silica gel phase change composite material, including following step
Suddenly：
By heat filling, microencapsulated phase change material and silica gel mixing deaeration solidify afterwards, graphene-based heat conductive silica gel is obtained
Phase change composite material, one kind in graphene, alumina powder, aluminium nitride powder and carbon nanotubes of the heat filling or
It is a variety of.
Preferably, the cured temperature is 120~130 DEG C, and the cured time is 10~60min.
Compared with prior art, the present invention provides a kind of graphene-based heat conductive silica gel phase change composite material, including：Silica gel
Matrix and it is scattered in the silica gel intrinsic silicon heat conduction phase-change material；The heat conduction phase-change material includes heat filling and micro- glue
Capsule phase-change material；The one kind or more of the heat filling in graphene, alumina powder, aluminium nitride powder and carbon nanotubes
Kind.The present invention improves the agglomeration of graphene by adding graphene and other species heat fillings into silica gel, and
By cooperative effect between heat filling, complete thermal conducting path can be formed in silica gel, improves the thermal conductivity of composite material.
Also, microencapsulated phase change material is added inside silica gel, improves the latent heat of compound silica gel material, can be stored up while heat conduction
Deposit a part of heat.
The result shows that the thermal conductivity of graphene-based heat conductive silica gel phase change composite material provided by the invention is 5~8W/ (m
K), it is 70~85KJ/KG to store energy value.
Embodiment
The present invention provides a kind of graphene-based heat conductive silica gel phase change composite material, including：
Silica gel matrix and it is scattered in the silica gel intrinsic silicon heat conduction phase-change material；
The heat conduction phase-change material includes heat filling and microencapsulated phase change material；The heat filling be selected from graphene,
Alumina powder, aluminium nitride powder or carbon nanotubes.
Graphene-based heat conductive silica gel phase change composite material provided by the invention includes silica gel matrix, and the present invention is to the silica gel
The species of matrix and source be not specifically limited, general commercially available.In the present invention, the silica gel is preferably the double groups of A/B
Part silica gel, the A/B two-components silica gel are selected from SEMICOSIL 9212A/B type A/B two-components silica gel, SilGel 612A/B types
A/B two-components silica gel, SEMICOSIL 905A/B types A/B two-components silica gel or SilGel 614A/B type A/B two-component silica gel.
A/B two-components silica gel of the present invention is preferably the A/B two-component silica gel of Wa Ke companies of Germany production.The A/B two-components
Silica gel A is silica gel, and B is curing agent, and without extra addition curing agent, its usage ratio is 1:1.
Graphene-based heat conductive silica gel phase change composite material provided by the invention, which further includes, is scattered in the silica gel intrinsic silicon
Heat conduction phase-change material.Wherein, the heat conduction phase-change material and the mass ratio of silica gel matrix are (50~70)：(30~50), at this
In some specific embodiments of invention, the mass ratio of the heat conduction phase-change material and silica gel matrix is 70：30, in the another of the present invention
In some specific embodiments, the mass ratio of the heat conduction phase-change material and silica gel matrix is 50：50.
In the present invention, the heat conduction phase-change material includes heat filling and microencapsulated phase change material.
In the present invention, the heat filling is in graphene, alumina powder, aluminium nitride powder and carbon nanotubes
It is one or more.Preferably, the heat filling includes one kind or more in alumina powder, aluminium nitride powder and carbon nanotubes
The dusty material and graphene of kind.In the present invention, the graphene powder is preferably 0.8-1 μm and/or 7-10 μm two kinds
The graphene of size.One or more dusty material in the alumina powder, aluminium nitride powder and carbon nanotubes and
The mass ratio of graphene is preferably (3~5)：1.
In the present invention, the alumina powder is preferably the alumina powder being modified by surface, and the present invention is to described
The method that surface is modified is not specifically limited, and well known to a person skilled in the art the method that surface is modified.The present invention is excellent
Choosing carries out surface modification to alumina powder as follows：
With water as solvent, after alumina powder is mixed with coupling agent, successively by ultrasound, centrifugation and drying process, obtain
To surface modified alumina powder.
Wherein, the alumina powder is preferably the alumina powder that particle size range is 1~70 μm, using above-mentioned particle diameter not
Effectively contact is so as to which the composite material being prepared has higher between homogeneous alumina powder can make alumina particle
Thermal conductivity.The coupling agent is preferably silane coupling agent, more preferably the silane coupling agent of model KH570.The aluminium oxide
The mass ratio of powder and silane coupling agent is preferably (8~10)：1.
The present invention is not specifically limited to the ultrasound, centrifugation and dry method, well known to a person skilled in the art
Ultrasound, centrifugation and dry method.
The aluminium nitride powder is preferably the aluminium nitride powder being modified by surface, the side of the invention being modified to the surface
Method is not specifically limited, and well known to a person skilled in the art the method that surface is modified.The present invention is preferably according to such as lower section
Method carries out surface modification to aluminium nitride powder：
Under 0 DEG C of water bath condition, aluminum nitride particle is scattered in sodium hydroxide solution, water bath sonicator, centrifuged, ethanol is washed
Through coupling agent treatment after washing, the aluminium nitride powder that surface is modified is obtained after dry.
In the present invention, the aluminum nitride particle is preferably the aluminum nitride particle that particle diameter is 4 μm, and the coupling agent is preferably
The silane coupling agent of silane coupling agent, more preferably model KH550 or KH570, the quality of the sodium hydrate aqueous solution are dense
Degree is preferably 30wt%.The mass ratio of the aluminum nitride particle and the coupling agent is preferably (8~10)：1.
In the present invention, the time of the water bath sonicator is preferably 20~30min.The present invention washes the centrifugation, ethanol
Wash and the method for coupling agent treatment is not specifically limited, well known to a person skilled in the art processing method.
Heat filling in heat conduction phase-change material of the present invention can also be carbon nanotubes, and the carbon nanotubes is preferred
For multi-walled carbon nanotube.
Microencapsulated phase change material is further included in the heat conduction phase-change material selected by the present invention, the present invention is to micro- glue
The species of capsule phase-change material is not specifically limited, and well known to a person skilled in the art microencapsulated phase change material.In this hair
In bright, core shell structure that the microencapsulated phase change material is made of wall material and core, wherein wall material are high molecular polymer, core
Material is phase-change material and the mixture of graphene.Wherein, graphene is preferably dimensioned to be 0.8~1 μm in the core.It is described micro-
Capsule phase change material is preferably dimensioned to be 5~6 μm.In the core, the mass ratio of phase-change material and graphene is preferably 1：
(0.1~0.2), more preferably 1：(0.15~0.18).
Preferably, the microencapsulated phase change material is selected from butyl stearate graphene composite phase-change material/polyurea microcapsule
Phase-change material, lauryl alcohol graphene composite phase-change material/urea formaldehyde resin microencapsulated phase change material, butyl stearate graphene are answered
Close phase-change material/melamine formaldehyde resin microencapsulated phase change material or n-octadecane graphene composite phase-change material/acrylic acid
Resin microcapsule phase-change material.
The present invention is not specifically limited to the specific source of the microencapsulated phase change material, can be it is general commercially available,
Can voluntarily it prepare.In the present invention, the preparation method of the microencapsulated phase change material can be interfacial polymerization, or
Situ aggregation method.
Wherein, the interfacial polymerization preferably carries out as follows：
Under the conditions of existing for initiator, two kinds of immiscible multi-functional monomers are mixed with the emulsion dissolved with core
Close, carry out interface polymerization reaction, obtain microencapsulated phase change material.Wherein, the reaction time of the interfacial polymerization is 5~6h, institute
The reaction temperature for stating interfacial polymerization is 70~75 DEG C.
The present invention is not specifically limited to the species of described two immiscible multi-functional monomers, passes through polymerization
Afterwards, the polymer obtained can be as the monomer of microencapsulated phase change material shell mechanism.In the present invention, it is described two not
The multi-functional monomer to mix is preferably styrene and methacrylic acid.The initiator is preferably azodiisobutyronitrile.
Emulsion of the present invention dissolved with core is preferably prepared as follows；
By core and emulsifying agent mixing and emulsifying, the emulsion dissolved with phase-change material is obtained.
In the present invention, the core is preferably composite phase-change material, and the composite phase-change material is phase-change material and ruler
The composite material of the very little graphene for being 0.8-1 μm.The present invention is not specifically limited to the specific species of the phase-change material, this
Phase-change material known to field technology personnel.It is furthermore preferred that the composite phase-change material is answered selected from n-octadecane graphene
Close phase-change material, butyl stearate graphene composite phase-change material, lauryl alcohol graphene composite phase-change material or butyl stearate
Graphene composite phase-change material.The core is preferably prepared by the following method：
After phase-change material is melted, mixed with the graphene that size is 0.8-1 μm, obtain core.
Wherein, the mass ratio of the phase-change material and graphene is preferably 1：(0.1~0.2), more preferably 1：(0.15~
0.18).The method that the present invention mixes the phase-change material with graphene is not specifically limited, can be equal by the graphene
The even mixed method being scattered in the phase-change material of melting, in the present invention, it is preferred to using ultrasonic agitation method into
Row mixing.
It is of the invention by core and emulsifying agent mixing and emulsifying after obtaining core, wherein, the emulsifying agent is preferably dodecyl
Sodium sulphate, the compound emulsifying agent of emulsifying agent Tween-80 and Span-80, phenylethylene-maleic anhydride (SMA) and alkyl phenol polyoxy second
The compound emulsifying agent or the compound emulsifying agent of emulsifier op-10 0 and resorcinol of alkene ether OP-10.In the present invention, the core
Mass ratio with emulsifying agent is preferably 1：(0.04~0.06).
The present invention is not specifically limited to the method for the emulsification, and well known to a person skilled in the art emulsification method to be
Can.
The situ aggregation method preferably carries out as follows：
Resin prepolymer is mixed with the emulsion dissolved with core, home position polymerization reaction is carried out, obtains microcapsule phase-change material
Material.The temperature of the home position polymerization reaction is 60~80 DEG C, and the time of the home position polymerization reaction is 2~5h, described in situ poly-
The pH value for closing reaction is 2~4.
Wherein, the present invention is not specifically limited to the species of the resin prepolymer, and microcapsules can be used as after polymerization
The resin prepolymer of phase-change material shell mechanism.Preferably, the resin prepolymer is selected from carbamide resin performed polymer, urea first
Urea formaldehyde performed polymer or melamine formaldehyde resin performed polymer.The present invention does not have the preparation method of the resin prepolymer
It is specifically limited, the preparation method of resin prepolymer well known to those skilled in the art.
Wherein, the preparation method of the emulsion dissolved with core prepares the side of microencapsulated phase change material with interfacial polymerization
The preparation method of the emulsion dissolved with core described in method is identical, and this will not be repeated here.
In the present invention, the mass ratio of the heat filling and microencapsulated phase change material is (15~50)：(20~32), it is excellent
Elect as (18~50)：(20~30).
The present invention, can be in silica gel by adding size into silica gel as 7-10 μm of graphene and other species heat fillings
It is middle to form complete effective thermal conducting path, improve the thermal conductivity of composite material.Also, microcapsule phase-change is added inside silica gel
Material, improves the latent heat of compound silica gel material, and a part of heat can be stored while heat conduction.
Present invention also offers a kind of preparation method of graphene-based heat conductive silica gel phase change composite material, including following step
Suddenly：
By heat filling, microencapsulated phase change material and silica gel mixing deaeration solidify afterwards, graphene-based heat conductive silica gel is obtained
Phase change composite material, one kind in graphene, alumina powder, aluminium nitride powder and carbon nanotubes of the heat filling or
It is a variety of.
The present invention first mixes heat filling, microencapsulated phase change material and silica gel, obtains mixed slurry.The present invention is right
The order of the mixing is not specifically limited, is preferably mixed as follows：
By one or more dusty materials in 7-10 μm of graphene and alumina powder, aluminium nitride powder and carbon nanotubes
Mixing, obtains mixed-powder；
The mixed-powder, microencapsulated phase change material and silica gel are mixed, obtain mixed slurry.
After obtaining mixed slurry, by the mixed slurry deaeration, deaeration machine used in the present invention has revolution concurrently and rotation carries out
The mixer of gravitational agitation function, carries out 5~30min of deaeration preferably in deaeration machine.
After deaeration, the mixed slurry is cured, obtains graphene-based heat conductive silica gel phase change composite material.In this hair
In bright, the cured temperature is preferably 120~130 DEG C, and the cured time is preferably 10~60min.
Test is carried out to the thermal conductivity of microencapsulated phase change material of the present invention to measure by laser heat conducting instrument；It is right
The energy storage of microencapsulated phase change material of the present invention is measured can be by differential scanning amount thermal analysis system (DSC).
The present invention improves the thermal conductivity of composite material by adding graphene into silica gel.Also, add inside silica gel
Enter microencapsulated phase change material, improve the latent heat of compound silica gel material, a part of heat can be stored while heat conduction.As a result
Show, the thermal conductivity of graphene-based heat conductive silica gel phase change composite material provided by the invention is 5~8W/ (mK), stores energy
It is worth for 70~85KJ/KG.
For a further understanding of the present invention, with reference to embodiment to graphene-based heat conductive silica gel phase transformation provided by the invention
Composite material and preparation method thereof illustrates, and protection scope of the present invention is not limited by the following examples.
The thermal conductivity of microencapsulated phase change material of the following embodiments to being prepared uses NETZSCH
LFA457MicroFlash laser heat conducting instruments are tested；Energy storage to microencapsulated phase change material of the present invention passes through model
It is measured for the differential scanning amount thermal analysis system (DSC) of Pyris Diamond DSC.
Embodiment 1
Step 1：12.5 part 37% of formalin is mixed with 6 parts of urea, few drops of triethanolamines adjusting PH is added and arrives
8.0-9.0, insulation reaction 2h obtains thick transparency liquid in 75 DEG C of water-baths；Diluted with isometric deionized water, by water-bath
Temperature is down to 65 DEG C, and stable ureaformaldehyde performed polymer is made.
Step 2：Lauryl alcohol (24 DEG C of phase transition temperature) is placed in 40 DEG C of constant temperature silicone oil baths, is added after melting completely
15wt% sizes are 0.8~1 μm of graphene, are sufficiently stirred ultrasound, are uniformly mixed it, obtain core.
Phenylethylene-maleic anhydride (SMA) assistant for emulsifying agent aqueous solution and emulsifying agent alkyl phenol that mass concentration is 5wt% are gathered
Ethylene oxide ether OP-10 is 8 according to mass ratio:2 with (emulsifying agent and assistant for emulsifying agent total amount account for core 4-6%, and its ratio be 8:2) with
Core mixes, and under 2500rpm rotating speeds, while coordinates sonic oscillation to obtain the core uniformly emulsified, wherein emulsifying
The mass ratio of the gross mass and core of agent and assistant for emulsifying agent is 1：20.
Step 3：The core emulsified is added in prepolymer, the HCl adjustments pH that 8mol/L is added after being sufficiently stirred is
3.0, after half an hour by system pH stabilization near 2.0, in microencapsulation processes, core quality is added into system
5wt%NaCl, after polycondensation reaction carries out 1h, is warming up to 75 DEG C, the reaction was continued 2h, after system is fully reacted, into system
Micro urea and ammonium persulfate are continuously added, reaction 20min removes remaining free formaldehyde.Washing, filter, dry microcapsules
Phase-change material, the particle size range for measuring the microencapsulated phase change material are 1-10 μm.
Step 4：With water as solvent, by the aluminium oxide mixed powder that size particles are inhomogenous, particle size range is 1~70 μm
End is with KH570 silane coupling agents according to 8：1 ratio mixing, ultrasound, centrifugation, drying process, obtains modified alumina powder
End.
It is 4 by mass ratio：1 obtained alumina powder and mixed-powder of the size for 7-10 μm of graphene, above-mentioned system
The microencapsulated phase change material obtained is with silica gel with 50:20：30 mass ratio is placed in deaeration machine, is stirred 10~15 minutes and is removed gas
Bubble.It is put into 120 DEG C of baking ovens, cures 10min, obtain graphene-based heat conductive silica gel phase change composite material.
The thermal conductivity for measuring the graphene-based heat conductive silica gel phase change composite material is 5-6W/ (mK), energy storage 70-
75KJ/KG。
Embodiment 2
It is 1 by molar ratio：3 melamine is mixed with the formalin of 37% mass fraction, adds few drops of triethanolamines
PH to 8.0-9.0 is adjusted, it is transparent to solution in 70 DEG C of stirred in water bath 1h, that is, obtain melamine formaldehyde resin prepolymer.
Butyl stearate (22 DEG C of phase transition temperature) is placed in 40 DEG C of constant temperature silicone oil baths, 15wt% rulers are added after melting completely
Very little is 0.8-1 μm of graphene, is sufficiently stirred ultrasound, is uniformly mixed it, obtains core.
By the emulsifier op-10 of 0.4wt% and the aqueous solution of the resorcinol of 2.5wt%, above-mentioned core is added while stirring
In material, under 60 DEG C of water bath conditions, lotion is made in reaction 0.5h.
The melamine formaldehyde resin prepolymer prepared is added dropwise in lotion obtained above with separatory funnel
(mass ratio=1 of the melamine formaldehyde resin prepolymer and above-mentioned emulsion：1), then low whipping speed is 200rpm's
Under the conditions of with the pH of first acid-conditioning solution be adjusted to 500rpm to 3-4, then by mixing speed, react 4h, protected in whole reaction process
Water holding bath temperature is 60 DEG C, and reaction product is filtered, and washing, dry microencapsulated phase change material is obtained after being dried in vacuo 24h.
It is 3 by mass ratio：1 size is 7-10 μm of graphene and mixed-powder, the above-mentioned microcapsule phase-change of carbon nanotubes
The silica gel of material and model SilGel 612A/B are with 18:32：50 mass ratio is placed in deaeration machine, stirs 10-15 minutes simultaneously
Remove bubble.It is put into 120 DEG C of baking ovens, cures 10min, obtain graphene-based heat conductive silica gel phase change composite material.
The thermal conductivity for measuring the graphene-based heat conductive silica gel phase change composite material is 6-7W/ (mK), energy storage 80-
85KJ/KG。
Embodiment 3
The size that 15wt% is added into the n-octadecane of melting is 0.8-1 μm of graphene, under 50 DEG C of water bath conditions, is fallen
Enter in homogeneous 3wt% lauryl sodium sulfate deionized water solutions, in the emulsified 30-40min of 1500r/min rotating speeds, at the same time
Logical nitrogen purging.(mass fraction here is the mass fraction relative to n-octadecane)
It is slowly dropped to by methacrylic acid and dissolved with the styrene of 1.3wt% oil-soluble initiator azodiisobutyronitriles
State in the solution after emulsification, the mass ratio 3 of the styrene and methacrylic acid：1, in 70 DEG C of water-baths, turned with 250r/min
Speed stirring continuous polymerization 5h.Reaction terminates, and is cleaned with deionized water and depressurizes suction filtration, and it is trickle that natural drying obtains white powder
Particle, i.e. microencapsulated phase change material.(mass fraction of the initiator azodiisobutyronitrile is to occupy styrene and metering system
The mass fraction of sour total amount)
Under 0 DEG C of water bath condition, the aluminum nitride particle that particle diameter is 4 μm is placed in 10wt% sodium hydroxide solutions, water-bath surpasses
Sound 20-30min, centrifugation, through silane coupling agent KH570 processing after ethanol washing, is dried to obtain modified aluminium nitride powder.
It is 4.3 by mass ratio：1 aluminium nitride powder and mixed-powder of the size for 7-10 μm of graphene, above-mentioned microcapsules phase
Become material with the silica gel of model SEMICOSIL 905A/B with 47:23：30 mass ratio is placed in deaeration machine, stirs 10-15
Minute simultaneously removes bubble.It is put into afterwards in 120 DEG C of baking ovens, cures 30min, obtain graphene-based heat conductive silica gel phase transformation composite wood
Material.
The thermal conductivity for measuring the graphene-based heat conductive silica gel phase change composite material is 7-8W/ (mK), energy storage 80-
85KJ/KG。
Embodiment 4
It is 1 by molar ratio：3 melamine is mixed with the formaldehyde of 37% mass fraction, is added few drops of triethanolamines and is adjusted
PH to 8.0-9.0, it is transparent to solution in 70-80 DEG C of stirred in water bath 1h, that is, obtain melamine formaldehyde resin prepolymer.
Butyl stearate (22 DEG C of phase transition temperature) is placed in 40-50 DEG C of constant temperature silicone oil bath, is added after melting completely
16wt% sizes are 0.8-1 μm of graphene, are sufficiently stirred ultrasound, are uniformly mixed it, obtain core.
By the emulsifying agent and the aqueous solution of the resorcinol of 2.5wt% that concentration is 0.4wt%, above-mentioned core is added while stirring
Material, under 60 DEG C of water bath conditions, lotion is made in reaction 1h.
The melamine formaldehyde resin prepolymer prepared is added dropwise in lotion obtained above with separatory funnel
(mass ratio=1 of the melamine formaldehyde resin prepolymer and lotion：1) condition that, then low whipping speed is 200rpm
The lower PH with first acid-conditioning solution is adjusted to 500rpm to 3-4, then by mixing speed, reacts 4h, water is kept in whole reaction process
Bath temperature is 60 DEG C, and reaction product is filtered, and washing, dry microencapsulated phase change material is obtained after being dried in vacuo 24h.
With water as solvent, by size particles are inhomogenous, particle diameter is 1-70 μm of alumina mixed powder and KH570 silane idol
Join agent according to 10:1-8：1 ratio mixing, ultrasound, centrifugation, drying process, obtains modified alumina powder.
It is 4 by mass ratio：1 obtained alumina powder and the mixed-powder of 7-10 μm of graphene, above-mentioned microcapsules phase
Become material with silica gel with 50:20：30 mass ratio is placed in deaeration machine, is stirred 10-15 minutes and is removed bubble.It is put into afterwards
In 120 DEG C of baking ovens, cure 30min, obtain graphene-based heat conductive silica gel phase change composite material.
The thermal conductivity for measuring the graphene-based heat conductive silica gel phase change composite material is 5-6W/ (mK), energy storage 80-
85KJ/KG。
Embodiment 5
The size that 18wt% is added into the n-octadecane of melting is 0.8-1 μm of graphene, under 50 DEG C of water bath conditions, is fallen
Enter in homogeneous 3wt% lauryl sodium sulfate deionized water solutions, in the emulsified 30-40min of 1500r/min rotating speeds, at the same time
Logical nitrogen purging.(mass fraction here is the mass fraction relative to n-octadecane)
It is slowly dropped to by methacrylic acid and dissolved with the styrene of 1.3wt% oil-soluble initiator azodiisobutyronitriles
State in the solution after emulsification, the mass ratio 3 of the styrene and methacrylic acid：1, in 70 DEG C of water-baths, turned with 250r/min
Speed stirring continuous polymerization 5h.Reaction terminates, and is cleaned with deionized water and depressurizes suction filtration, and it is trickle that natural drying obtains white powder
Particle, i.e. microencapsulated phase change material.(mass fraction of the initiator azodiisobutyronitrile is to occupy styrene and metering system
The mass fraction of sour total amount)
With water as solvent, by size particles are inhomogenous, particle diameter is 1-70 μm of alumina mixed powder and KH570 silane idol
Join agent according to 10：1 ratio mixing, ultrasound, centrifugation, drying process, obtains modified alumina powder.
It is 4 by mass ratio：1 obtained alumina powder and size for 7-10 μm of graphene mixed-powder, above-mentioned micro-
Capsule phase change material is with silica gel with 50:20：30 mass ratio is placed in deaeration machine, is stirred 10-15 minutes and is removed bubble.Afterwards
It is put into 120 DEG C of baking ovens, cures 30min, obtain graphene-based heat conductive silica gel phase change composite material.
The thermal conductivity for measuring the graphene-based heat conductive silica gel phase change composite material is 5-6W/ (mK), energy storage 80-
85KJ/KG。
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (6)
- A kind of 1. graphene-based heat conductive silica gel phase change composite material, it is characterised in that including：Silica gel matrix and it is scattered in the silica gel intrinsic silicon heat conduction phase-change material；The heat conduction phase-change material includes heat filling and microencapsulated phase change material；The heat filling include alumina powder, One or more dusty materials and graphene in aluminium nitride powder and carbon nanotubes；The microencapsulated phase change material be by The core shell structure of core and wall material composition, the wall material are high molecular polymer, and the core is phase-change material and graphene Mixture；The heat conduction phase-change material and the mass ratio of silica gel matrix are (50~70)：(30~50)；The mass ratio of the heat filling and microencapsulated phase change material is (15~50)：(20~32)；The alumina powder is the alumina powder being modified by surface, and the aluminium nitride powder is the nitrogen being modified by surface Change aluminium powder.
- 2. composite material according to claim 1, it is characterised in that the size of the graphene for 0.8~1 μm or 7~ 10μm。
- 3. composite material according to claim 1, it is characterised in that it is 1~70 μm that the alumina powder, which is selected from particle diameter, Alumina mixed powder.
- 4. composite material according to claim 1, it is characterised in that the silica gel is A/B two-component silica gel, the A/B Two-component silica gel be selected from SEMICOSIL 9212A/B type A/B two-components silica gel, SilGel612A/B type A/B two-components silica gel, SEMICOSIL 905A/B types A/B two-components silica gel or SilGel 614A/B type A/B two-component silica gel.
- 5. composite material according to claim 1, it is characterised in that the preparation method of the microencapsulated phase change material is boundary Face polymerization or situ aggregation method.
- 6. a kind of preparation method of graphene-based heat conductive silica gel phase change composite material as claimed in any one of claims 1 to 5, wherein, It is characterised in that it includes following steps：By heat filling, microencapsulated phase change material and silica gel mixing deaeration solidify afterwards, graphene-based heat conductive silica gel phase transformation is obtained Composite material, the heat filling include one or more powder in alumina powder, aluminium nitride powder and carbon nanotubes Material and graphene；The core shell structure that the microencapsulated phase change material is made of core and wall material, the wall material are high score Sub- polymer, the core are phase-change material and the mixture of graphene.
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